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JP4357693B2 - Cooling water passage structure for water-cooled internal combustion engine - Google Patents
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JP4357693B2 - Cooling water passage structure for water-cooled internal combustion engine - Google Patents

Cooling water passage structure for water-cooled internal combustion engine Download PDF

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Publication number
JP4357693B2
JP4357693B2 JP2000115415A JP2000115415A JP4357693B2 JP 4357693 B2 JP4357693 B2 JP 4357693B2 JP 2000115415 A JP2000115415 A JP 2000115415A JP 2000115415 A JP2000115415 A JP 2000115415A JP 4357693 B2 JP4357693 B2 JP 4357693B2
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Prior art keywords
cooling water
passage
combustion engine
internal combustion
radiator
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JP2001295646A (en
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新一 中野
栄 水村
克徳 高橋
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Honda Motor Co Ltd
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Honda Motor Co Ltd
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Priority to JP2000115415A priority Critical patent/JP4357693B2/en
Priority to CNB011220945A priority patent/CN1139721C/en
Priority to TW090205818U priority patent/TW482247U/en
Priority to EP01109545A priority patent/EP1148216B1/en
Priority to ES200100886A priority patent/ES2190334B1/en
Publication of JP2001295646A publication Critical patent/JP2001295646A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P7/00—Controlling of coolant flow
    • F01P7/14—Controlling of coolant flow the coolant being liquid
    • F01P7/16—Controlling of coolant flow the coolant being liquid by thermostatic control
    • F01P7/165—Controlling of coolant flow the coolant being liquid by thermostatic control characterised by systems with two or more loops
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M31/00—Apparatus for thermally treating combustion-air, fuel, or fuel-air mixture
    • F02M31/02—Apparatus for thermally treating combustion-air, fuel, or fuel-air mixture for heating
    • F02M31/04—Apparatus for thermally treating combustion-air, fuel, or fuel-air mixture for heating combustion-air or fuel-air mixture
    • F02M31/10—Apparatus for thermally treating combustion-air, fuel, or fuel-air mixture for heating combustion-air or fuel-air mixture by hot liquids, e.g. lubricants or cooling water
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P3/00—Liquid cooling
    • F01P3/20—Cooling circuits not specific to a single part of engine or machine
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P7/00—Controlling of coolant flow
    • F01P7/14—Controlling of coolant flow the coolant being liquid
    • F01P7/16—Controlling of coolant flow the coolant being liquid by thermostatic control
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Temperature-Responsive Valves (AREA)

Description

【０００１】
【産業上の利用分野】
本発明は、水冷式内燃機関の冷却水通路構造、特にサーモスタット弁から気化器へ向かう温水ライザー通路内の冷却水流の断続を、該通路の配置自由度を損なうことなく、また構造を複雑にすることなく、確実に行なうことができる水冷式内燃機関の冷却水通路の構造に関する。
【０００２】
【従来の技術】
図１０は従来の水冷式内燃機関の冷却水通路構造の一例を示す全体構成図、図１１は同じく一部を省略した概要図である。
【０００３】
冷却水は冷却水ポンプ01から通路02を経て内燃機関のウォータジャケット03に送給され、同内燃機関を冷却して自らは加熱される。そして通路04，06を経てラジエータ07に至り、ここで冷却された後、通路08を経て再び冷却水ポンプ01の入口に還流される。
【０００４】
このような冷却水循環通路のウォータジャケット03とラジエータ07の間にサーモスタット弁05が設けられる。そしてこのサーモスタット弁05から冷却水ポンプ01の入口に至るバイパス通路09と、上記サーモスタット弁05から気化器011を経て上記冷却水ポンプ01の入口に至る温水ライザ通路010が設けられる。
【０００５】
次に図１２は図１０および図１１中のサーモスタット弁05を示す詳細縦断側面図である。
【０００６】
これらの図中、050は冷却水吸入部、051は第１冷却水吐出部、052は第２冷却水吐出部、053は第３冷却水吐出部である。第３冷却水吐出部053は第２冷却水吐出部052から分岐している。冷却水吸入部050には前記図１０の通路04が接続され、内燃機関のウォータジャケット03から冷却水が導入される。第１冷却水吐出部051には前記ラジエータ07に至る通路06が接続される。第２冷却水吐出部052には前記冷却水ポンプ01に至るバイパス通路09が接続され、第３冷却水吐出部053には前記気化器011に至る温水ライザ通路010が接続される。
【０００７】
サーモスタット弁05に流入する冷却水の温度は、ワックス等が収容された感温部056によって検知される。そしてそれが所定温度以下の状態では第１バルブ054が閉じられ、冷却水吸入部050と第１冷却水吐出部051とが遮断される。冷却水温度が上記所定温度以上に上昇した状態になると、第１バルブ054が開いて冷却水吸入部050と第１冷却水吐出部051は連通し、前記内燃機関のウォータジャケット03で高温に加熱された冷却水が前記ラジエータ07に供給されて、同ラジエータ07で冷却されるようになっている。
【０００８】
さらにサーモスタット弁05の下部、第２冷却水吐出部052には第２バルブ055が設けられていて、第１バルブ054の開放と閉止に連動して、逆に閉止と開放を行なうようになっている。したがって、冷却水温度が所定温度以下の状態では、第２バルブ055が開いて冷却水吸入部050と第２冷却水吐出部052および第３冷却水吐出部053とが連通し、冷却水温度が上記所定温度以上に上昇した状態になると、逆に第２バルブ055が閉じて冷却水吸入部050と第２冷却水吐出部052および第３冷却水吐出部053とが遮断される。こうして内燃機関の低温始動時等には、前記ウォータジャケット03内で加熱された冷却水が前記気化器011のジャケットに供給されて、気化器011内の低速燃料供給口近傍を加熱し、同低速燃料供給口の結氷が阻止されるようになっている。
【０００９】
【発明が解決しようとする課題】
前記従来の冷却水通路構造においては、温水ライザ通路010の入口すなわち第３冷却水吐出部053がバイパス通路09の入り口すなわち第２冷却水吐出部052から分岐していて、サーモスタット弁05の第２バルブ055がボトムバイパス通路09の入口を開閉することにより、間接的に温水ライザ通路010の入り口を開閉する構造である。すなわち、温水ライザ通路010の入口を直接開閉する機構がないので、第２バルブ055が閉じても、温水ライザ通路010内の水流を完全に遮断するには、バイパス通路09と温水ライザ通路010の間に圧力差がない位置を選ぶ必要があり、レイアウトの自由がなかった。
【００１０】
【課題を解決するための手段および効果】
前記課題を解決するために、請求項１記載の発明は、内燃機関のウォータジャケットとラジエータとの間で冷却水を循環させる冷却水ポンプを設け、サーモスタット弁により冷却水の循環量を制御しつつ、冷間時にはバイパス通路によりラジエータを介さずに冷却水を循環させるようにした水冷式内燃機関の冷却水通路構造において、上記バイパス通路と並列に形成された温水ライザー通路の一端を上記冷却水ポンプの出入口に連通させるとともに他端を上記サーモスタット弁の上記バイパス通路出入口開閉部に対して独立して連通させ、上記サーモスタット弁における上記バイパス通路出入口と上記温水ライザー通路出入口とが同一の弁体によって開閉されるようにしたことを特徴とする。
【００１１】
請求項１記載の発明は上記のとおり構成されているので、バイパス通路と温水ライザ通路の圧力バランス等を配慮する必要はない。したがって、温水ライザ通路内の冷却水流の断続を、レイアウトの自由度を損なうことなく、確実に行なうことができる。すなわち、温水ライザ通路の配置自由度が向上する。そして、断続の確実さを求めて温水ライザ通路に別の開閉手段、例えばサーモバルブを設ける場合と比較して、コスト・重量・スペースいずれの面でも有利である。
【００１２】
請求項２に記載の発明は、内燃機関のウォータジャケットとラジエータとの間で冷却水を循環させる冷却水ポンプを設け、サーモスタット弁により冷却水の循環量を制御しつつ、冷間時にはバイパス通路によりラジエータを介さずに冷却水を循環させるようにした水冷式内燃機関の冷却水通路構造において、上記バイパス通路と並列に形成されて気化器を経由する温水ライザー通路の一端を上記冷却水ポンプの出入口に連通させるとともに他端を上記サーモスタット弁の上記バイパス通路出入口開閉部に対して独立して連通させ、上記サーモスタット弁における上記バイパス通路出入口と上記温水ライザー通路出入口とが同一の弁体によって開閉されるようにしたことを特徴とする。
【００１３】
請求項３に記載の発明は、内燃機関のウォータジャケットとラジエータとの間で冷却水を循環させる冷却水ポンプを設け、サーモスタット弁により冷却水の循環量を制御しつつ、冷間時にはバイパス通路によりラジエータを介さずに冷却水を循環させるようにし、上記サーモスタット弁には第１、第２および第３の冷却水吐出部を設け、第１の冷却水吐出部には、ラジエータに至る通路を接続し、第２の冷却水吐出部には、上記冷却水ポンプに接続される上記バイパス通路を接続し、第３の冷却水吐出部には、上記バイパス通路と並列に形成されて気化器を経由する温水ライザ通路を接続した水冷式内燃機関の冷却水通路構造において、上記第２の冷却水吐出部および上記第３の冷却水吐出部を同時に開閉する同一の弁体を設けたことを特徴とする。
【００１４】
【発明の実施の形態】
図１は本発明の一実施形態を示す全体構成図、図２は同じく一部を省略した概要図である。
【００１５】
冷却水は冷却水ポンプ１から通路２を経て内燃機関のウォータジャケット３に送給され、同内燃機関を冷却して自らは加熱される。そして通路４，６を経てラジエータ７に至り、ここで冷却された後、通路８を経て再び冷却水ポンプ１の入口に還流される。
【００１６】
このような冷却水循環通路のウォータジャケット３とラジエータ７の間にサーモスタット弁５が設けられる。そしてこのサーモスタット弁５から冷却水ポンプ１の入口に至るバイパス通路９と、上記サーモスタット弁５から気化器11を経て上記冷却水ポンプ１の入り口に至る温水ライザ通路10が設けられる。
【００１７】
次に図３は図１および図２中のサーモスタット弁５のラジエータ側出口開放の状態を示す詳細縦断側面図、図４は同じく閉止の状態を示す詳細縦断側面図である。
【００１８】
これらの図中、50は冷却水吸入部、51は冷却水吐出部、52は第２冷却水吐出部、53は第３冷却水吐出部である。冷却水吸入部50には前記図１の通路４が接続され、内燃機関のウォータジャケット３から冷却水が導入される。第１冷却水吐出部51には前記ラジエータ７に至る通路６が接続される。第２冷却水吐出部52には前記冷却水ポンプ１に至るバイパス通路９が接続され、第３冷却水吐出部53には前記気化器11に至る温水ライザ通路10が接続される。この第３冷却水吐出部53は、貫通孔53ａによって冷却水吸入部50と連通している。すなわち、第２冷却水吐出部52と第３冷却水吐出部53は、従来のように一方が他方から分岐するのではなく、互いに独立している。
【００１９】
サーモスタット弁５に流入する冷却水の温度は、ワックス等が収容された感温部56によって検知される。そしてそれが所定温度以下の状態では第１バルブ54が閉じられ、冷却水吸入部50と第１冷却水吐出部51とが遮断される。冷却水温度が上記所定温度以上に上昇した状態になると、第１バルブ54が開いて冷却水吸入部50と第１冷却水吐出部51は連通し、前記内燃機関のウォータジャケット３で高温に加熱された冷却水が前記ラジエータ７に供給されて、同ラジエータ７で冷却されるようになっている。
【００２０】
さらにサーモスタット弁５の下部、第２冷却水吐出部52および第３冷却水吐出部53には第２バルブ55が設けられていて、第１バルブ54の開放と閉止に連動し、逆に閉止と開放を同時に行なうようになっている。したがって、冷却水温度が所定温度以下の状態では、第２バルブ55が開いて冷却水吸入部50と第２冷却水吐出部52および第３冷却水吐出部53とが連通し、逆に冷却水温度が上記所定温度以上に上昇した状態になると、第２バルブ55が閉じて冷却水吸入部50と第２冷却水吐出部52および第３冷却水吐出部53が遮断される。こうして内燃機関の低温始動時等には、前記ウォータジャケット３内で加熱された冷却水が前記気化器11のジャケットに供給されて、気化器11内の低速燃料供給口近傍を加熱し、同低速燃料供給口の結氷が阻止されるようになっている。
【００２１】
本実施形態では、第２冷却水吐出部52と第３冷却水吐出部53が、従来のように一方が他方から分岐するのではなく、それぞれ独立に設けられているので、バイパス通路９と温水ライザ通路10の圧力バランス等を配慮する必要はないから、したがって温水ライザ通路10内の冷却水流の断続を、レイアウトの自由度を損なうことなく、確実に行なうことができる。すなわち、温水ライザ通路10の配置自由度が向上する。
【００２２】
また本実施形態では、同一の弁体（第２バルブ55）によって第２冷却水吐出部52および第３冷却水吐出部53を同時に開閉するので、図９に例示するように断続の確実さを求めて温水ライザ通路10に別の開閉手段、例えば温水ライザ通路専用のサーモバルブ12を設ける場合と比較して、コスト・重量・スペースのいずれの面でも有利である。
【００２３】
次に図５は本発明の第２の実施形態におけるサーモスタット弁を示す縦断側面図である。この実施形態では、第２バルブ55の弁体に冷却水吸入部50と第２冷却水吐出部52とを連通する小さな貫通孔55ａが設けられている。その他の構成は前記第１の実施形態と同様であるので、前記第１の実施形態と同一の符号を付けてある。
【００２４】
本実施例では冷却水吸入部50と第２冷却水吐出部52が貫通孔55ａを介して常に連通していて、常に少量の冷却水がバイパス通路９内を流れるので、サーモスタット弁５の第２バルブ55が閉じた状態でもバイパス通路９に少量の冷却水を流しておきたい場合、温水ライザ通路10の入り口である第３冷却水吐出部53は独立して閉じることができる。したがって、１つのバルブで２つの通路の水流を制御することができる。
【００２５】
次に図６は本発明の第３の実施形態を示す全体構成図である。前記実施形態においては、冷却水ポンプからウォータジャケット、ラジエータを順次経由して再び上記冷却水ポンプ入口に還流する冷却水循環通路に本発明を適用したものであったのに対し、本実施形態では、冷却水ポンプ１からラジエータ７、ウォータジャケット３を順次経由して上記冷却水ポンプ１の入口に還流する冷却水循環通路に本発明を適用する。このようにしても、前記実施形態と同様の作用効果を得ることができる。
【００２６】
次に図７は本発明の第４の実施形態を示す全体構成図、図８は図７中のサーモスタット弁15を示す詳細縦断側面図である。本実施形態では、内燃機関のウォータジャケット３から直接ラジエータ７に冷却水が送給される通路、同ウォータジャケット３から気化器11を経てサーモスタット弁15に至る通路が設けられている。
【００２７】
またサーモスタット弁15においては、図８に示されるように、冷却水吐出部150が冷却水ポンプ１の吸入口に、第１冷却水吸入部151がラジエータ７の冷却水出口に、第２冷却水吸入部152が内燃機関のウォータジャケット３の冷却水出口に、第３冷却水吸入部153が気化器11の冷却水出口に、それぞれ接続される。
【００２８】
サーモスタット弁15に流入する冷却水の温度は、ワックス等が収容された感温部156によって検知される。そしてそれが所定温度以下の状態では第１バルブ154が閉じられ、冷却水吐出部150と第１冷却水吸入部151とが遮断される。冷却水温度が上記所定温度以上に上昇した状態になると、第１バルブ154が開いて冷却水吐出部150に第１冷却水吸入部151は連通し、前記内燃機関のウォータジャケット３で高温に過熱された冷却水が前記ラジエータ７に供給されて、同ラジエータ７で冷却されるようになっている。
【００２９】
さらにサーモスタット弁15の下部、第２冷却水吸入部152および第３冷却水吸入部153には第２バルブ155が設けられていて、第１バルブ154の開放と閉止に連動し、逆に閉止と開放を同時に行なうようになっている。したがって、冷却水温度が所定温度以下の状態では、第２バルブ155が開いて冷却水吐出部150と第２冷却水吸入部152および第３冷却水吸入部153とが連通し、逆に冷却水温度が上記所定温度以上に上昇した状態になると、第２バルブ155が閉じて冷却水吐出部150と第２冷却水吸入部152および第３冷却水吸入部153が遮断される。こうして内燃機関の低温始動時等には、前記ウォータジャケット３内で加熱された冷却水が前記気化器11のジャケットに供給されて、気化器11内の低速燃料供給口近傍を加熱し、同低速燃料供給口の結氷が阻止されるようになっている。
【００３０】
こうして、本実施形態においても、前記諸実施形態と同様の作用効果が得られる。
【図面の簡単な説明】
【図１】図１は本発明の一実施形態を示す全体構成図である。
【図２】図２は同じく一部を省略した概要図である。
【図３】図３は図１および図２中のサーモスタット弁のラジエータ側出口開放の状態を示す詳細縦断側面図である。
【図４】図４は同じく閉止の状態を示す詳細縦断側面図である。
【図５】図５は本発明の第２の実施形態におけるサーモスタット弁を示す詳細縦断側面図である。
【図６】図６は本発明の第３の実施形態を示す全体構成図である。
【図７】図７は本発明の第４の実施形態を示す全体構成図である。
【図８】図８は図７中のサーモスタット弁を示す詳細縦断側面図である。
【図９】図９は本発明の効果を説明するために比較する冷却水通路構造を示す図である。
【図１０】図１０は従来の冷却水通路構造の一例を示す全体構成図である。
【図１１】図１１は同じく一部を省略した概要図である。
【図１２】図１２は図１０および図１１中のサーモスタット弁を示す詳細縦断側面図である。
【符号の説明】
01，１…冷却水ポンプ、02，２…通路、03，３…ウォータジャケット、04，４…通路、05，５，15…サーモスタット弁、06，６…通路、07，７…ラジエータ、08，８…通路、09，９…バイパス通路、010，10…温水ライザ通路、011，11…気化器、050，50…冷却水吸入部、051，51…第１冷却水吐出部、052，52…第２冷却水吐出部、053，53…第３冷却水吐出部、53ａ…貫通孔、054，54，154…第１バルブ、055，55，155…第２バルブ、55ａ…貫通孔、056，56，156…感温部、150…冷却水吐出部、151…第１冷却水吸入部、152…第２冷却水吸入部、153…第３冷却水吸入部。[0001]
[Industrial application fields]
The present invention relates to a cooling water passage structure of a water-cooled internal combustion engine, and more particularly to intermittent cooling water flow in a hot water riser passage from a thermostat valve to a vaporizer without compromising the degree of freedom of arrangement of the passage. The present invention relates to a structure of a cooling water passage of a water-cooled internal combustion engine that can be reliably performed.
[0002]
[Prior art]
FIG. 10 is an overall configuration diagram illustrating an example of a cooling water passage structure of a conventional water-cooled internal combustion engine, and FIG. 11 is a schematic diagram in which a part is similarly omitted.
[0003]
The cooling water is supplied from the cooling water pump 01 through the passage 02 to the water jacket 03 of the internal combustion engine, and the internal combustion engine is cooled to heat itself. Then, it passes through the passages 04 and 06 to reach the radiator 07, where it is cooled and then returned to the inlet of the cooling water pump 01 again through the passage 08.
[0004]
A thermostat valve 05 is provided between the water jacket 03 and the radiator 07 in the cooling water circulation passage. A bypass passage 09 extending from the thermostat valve 05 to the inlet of the cooling water pump 01 and a hot water riser passage 010 extending from the thermostat valve 05 through the vaporizer 011 to the inlet of the cooling water pump 01 are provided.
[0005]
Next, FIG. 12 is a detailed longitudinal sectional side view showing the thermostat valve 05 in FIGS. 10 and 11.
[0006]
In these drawings, 050 is a cooling water suction portion, 051 is a first cooling water discharge portion, 052 is a second cooling water discharge portion, and 053 is a third cooling water discharge portion. The third cooling water discharge part 053 branches from the second cooling water discharge part 052. 10 is connected to the cooling water suction portion 050, and cooling water is introduced from the water jacket 03 of the internal combustion engine. A passage 06 leading to the radiator 07 is connected to the first coolant discharge unit 051. A bypass passage 09 leading to the cooling water pump 01 is connected to the second cooling water discharge portion 052, and a hot water riser passage 010 leading to the vaporizer 011 is connected to the third cooling water discharge portion 053.
[0007]
The temperature of the cooling water flowing into the thermostat valve 05 is detected by a temperature sensing unit 056 that contains wax or the like. When the temperature is lower than the predetermined temperature, the first valve 054 is closed, and the cooling water suction part 050 and the first cooling water discharge part 051 are shut off. When the cooling water temperature rises above the predetermined temperature, the first valve 054 opens and the cooling water suction part 050 and the first cooling water discharge part 051 communicate with each other and are heated to a high temperature by the water jacket 03 of the internal combustion engine. The cooled water is supplied to the radiator 07 and cooled by the radiator 07.
[0008]
Further, a second valve 055 is provided in the lower part of the thermostat valve 05 and in the second cooling water discharge part 052, and the first valve 054 is closed and opened in conjunction with the opening and closing of the first valve 054. Yes. Therefore, in the state where the cooling water temperature is equal to or lower than the predetermined temperature, the second valve 055 is opened and the cooling water suction part 050 communicates with the second cooling water discharge part 052 and the third cooling water discharge part 053, and the cooling water temperature is When the temperature rises above the predetermined temperature, the second valve 055 is closed and the cooling water suction part 050, the second cooling water discharge part 052, and the third cooling water discharge part 053 are shut off. Thus, when the internal combustion engine is cold started, the cooling water heated in the water jacket 03 is supplied to the jacket of the carburetor 011 to heat the vicinity of the low-speed fuel supply port in the carburetor 011. Freezing of the fuel supply port is prevented.
[0009]
[Problems to be solved by the invention]
In the conventional cooling water passage structure, the inlet of the hot water riser passage 010, that is, the third cooling water discharge portion 053 diverges from the inlet of the bypass passage 09, that is, the second cooling water discharge portion 052, and the second thermostat valve 05 The valve 055 opens and closes the inlet of the bottom bypass passage 09 to indirectly open and close the inlet of the hot water riser passage 010. That is, since there is no mechanism for directly opening and closing the inlet of the hot water riser passage 010, the water flow in the hot water riser passage 010 can be completely blocked even if the second valve 055 is closed. It was necessary to select a position where there was no pressure difference between them, and there was no freedom in layout.
[0010]
[Means for solving the problems and effects]
In order to solve the above-mentioned problem, the invention according to claim 1 is provided with a cooling water pump for circulating the cooling water between the water jacket and the radiator of the internal combustion engine, and controlling the circulation amount of the cooling water by the thermostat valve. In a cooling water passage structure of a water-cooled internal combustion engine in which cooling water is circulated by a bypass passage without using a radiator when cold, one end of a hot water riser passage formed in parallel with the bypass passage is connected to the cooling water pump. The other end of the thermostat valve communicates with the bypass passage inlet / outlet opening / closing portion independently, and the bypass passage inlet / outlet and the hot water riser passage inlet / outlet of the thermostat valve are opened and closed by the same valve body. It is made to be made to be done.
[0011]
Since the invention according to claim 1 is configured as described above, it is not necessary to consider the pressure balance between the bypass passage and the hot water riser passage. Therefore, the cooling water flow in the hot water riser passage can be reliably interrupted without impairing the flexibility of layout. That is, the degree of freedom of arrangement of the hot water riser passage is improved. In addition, it is advantageous in terms of cost, weight, and space as compared with the case where another open / close means such as a thermo valve is provided in the hot water riser passage in order to ensure the intermittentness.
[0012]
The invention according to claim 2 is provided with a cooling water pump that circulates cooling water between the water jacket and the radiator of the internal combustion engine, and controls the circulation amount of the cooling water by a thermostat valve, and by a bypass passage when cold. In a cooling water passage structure of a water-cooled internal combustion engine in which cooling water is circulated without passing through a radiator, one end of a hot water riser passage formed in parallel with the bypass passage and passing through a vaporizer is connected to the inlet / outlet of the cooling water pump And the other end independently communicates with the bypass passage inlet / outlet opening / closing portion of the thermostat valve, and the bypass passage inlet / outlet and the hot water riser passage inlet / outlet in the thermostat valve are opened / closed by the same valve element. It is characterized by doing so.
[0013]
According to a third aspect of the present invention, there is provided a cooling water pump for circulating the cooling water between the water jacket and the radiator of the internal combustion engine, and the circulation amount of the cooling water is controlled by a thermostat valve, while the cooling water is cooled by the bypass passage. Cooling water is circulated without using a radiator, and the thermostat valve is provided with first, second and third cooling water discharge portions, and a passage leading to the radiator is connected to the first cooling water discharge portion. The bypass passage connected to the cooling water pump is connected to the second cooling water discharge portion, and the third cooling water discharge portion is formed in parallel with the bypass passage and passes through the vaporizer. In a cooling water passage structure of a water-cooled internal combustion engine to which a hot water riser passage is connected, the same valve body that opens and closes the second cooling water discharge portion and the third cooling water discharge portion simultaneously is provided. To.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is an overall configuration diagram showing an embodiment of the present invention, and FIG.
[0015]
The cooling water is fed from the cooling water pump 1 through the passage 2 to the water jacket 3 of the internal combustion engine, and the internal combustion engine is cooled to heat itself. Then, it reaches the radiator 7 through the passages 4 and 6, is cooled here, and is then returned to the inlet of the cooling water pump 1 again through the passage 8.
[0016]
A thermostat valve 5 is provided between the water jacket 3 and the radiator 7 in the cooling water circulation passage. A bypass passage 9 extending from the thermostat valve 5 to the inlet of the cooling water pump 1 and a hot water riser passage 10 extending from the thermostat valve 5 through the vaporizer 11 to the inlet of the cooling water pump 1 are provided.
[0017]
Next, FIG. 3 is a detailed longitudinal side view showing a state in which the radiator side outlet of the thermostat valve 5 in FIGS. 1 and 2 is open, and FIG. 4 is a detailed longitudinal side view showing the closed state.
[0018]
In these figures, 50 is a cooling water suction part, 51 is a cooling water discharge part, 52 is a 2nd cooling water discharge part, 53 is a 3rd cooling water discharge part. The passage 4 in FIG. 1 is connected to the cooling water suction portion 50, and cooling water is introduced from the water jacket 3 of the internal combustion engine. A passage 6 reaching the radiator 7 is connected to the first cooling water discharge part 51. A bypass passage 9 leading to the cooling water pump 1 is connected to the second cooling water discharge portion 52, and a hot water riser passage 10 leading to the vaporizer 11 is connected to the third cooling water discharge portion 53. The third cooling water discharge part 53 communicates with the cooling water suction part 50 through a through hole 53a. That is, the second cooling water discharge part 52 and the third cooling water discharge part 53 are independent from each other, rather than one branching from the other as in the prior art.
[0019]
The temperature of the cooling water flowing into the thermostat valve 5 is detected by the temperature sensing unit 56 in which wax or the like is accommodated. When the temperature is lower than the predetermined temperature, the first valve 54 is closed, and the cooling water suction part 50 and the first cooling water discharge part 51 are shut off. When the cooling water temperature rises above the predetermined temperature, the first valve 54 opens and the cooling water suction part 50 and the first cooling water discharge part 51 communicate with each other and are heated to a high temperature by the water jacket 3 of the internal combustion engine. The cooled cooling water is supplied to the radiator 7 and cooled by the radiator 7.
[0020]
Further, the lower part of the thermostat valve 5, the second cooling water discharge part 52 and the third cooling water discharge part 53 are provided with a second valve 55, which is interlocked with the opening and closing of the first valve 54 and closed. Opening is performed at the same time. Therefore, when the cooling water temperature is lower than the predetermined temperature, the second valve 55 is opened and the cooling water suction part 50 communicates with the second cooling water discharge part 52 and the third cooling water discharge part 53. When the temperature rises above the predetermined temperature, the second valve 55 is closed and the cooling water suction part 50, the second cooling water discharge part 52, and the third cooling water discharge part 53 are shut off. Thus, when the internal combustion engine is started at a low temperature, the cooling water heated in the water jacket 3 is supplied to the jacket of the carburetor 11 to heat the vicinity of the low speed fuel supply port in the carburetor 11 and Freezing of the fuel supply port is prevented.
[0021]
In the present embodiment, the second cooling water discharge part 52 and the third cooling water discharge part 53 are not provided separately from one another as in the prior art, but are provided independently from each other. Since there is no need to consider the pressure balance of the riser passage 10, etc., therefore, the cooling water flow in the hot water riser passage 10 can be reliably interrupted without impairing the flexibility of layout. That is, the degree of freedom of arrangement of the hot water riser passage 10 is improved.
[0022]
In this embodiment, since the second cooling water discharge part 52 and the third cooling water discharge part 53 are simultaneously opened and closed by the same valve body (second valve 55), the reliability of intermittentness is ensured as illustrated in FIG. Accordingly, it is advantageous in terms of cost, weight, and space as compared with a case where another open / close means is provided in the hot water riser passage 10, for example, a thermo valve 12 dedicated to the hot water riser passage.
[0023]
Next, FIG. 5 is a longitudinal side view showing a thermostat valve according to the second embodiment of the present invention. In this embodiment, the valve body of the second valve 55 is provided with a small through hole 55a that allows the cooling water suction part 50 and the second cooling water discharge part 52 to communicate with each other. Since other configurations are the same as those of the first embodiment, the same reference numerals as those of the first embodiment are given.
[0024]
In this embodiment, the cooling water suction part 50 and the second cooling water discharge part 52 are always in communication with each other through the through hole 55a, and a small amount of cooling water always flows through the bypass passage 9, so that the second thermostat valve 5 When a small amount of cooling water is desired to flow through the bypass passage 9 even when the valve 55 is closed, the third cooling water discharge portion 53 that is the entrance of the hot water riser passage 10 can be independently closed. Therefore, the water flow in the two passages can be controlled by one valve.
[0025]
Next, FIG. 6 is an overall configuration diagram showing a third embodiment of the present invention. In the above embodiment, the present invention is applied to the cooling water circulation passage that recirculates from the cooling water pump to the cooling water pump inlet again sequentially through the water jacket and the radiator, whereas in the present embodiment, The present invention is applied to the cooling water circulation passage that returns from the cooling water pump 1 to the inlet of the cooling water pump 1 through the radiator 7 and the water jacket 3 in order. Even if it does in this way, the effect similar to the said embodiment can be acquired.
[0026]
Next, FIG. 7 is an overall configuration diagram showing a fourth embodiment of the present invention, and FIG. 8 is a detailed longitudinal sectional side view showing a thermostat valve 15 in FIG. In the present embodiment, there are provided a passage through which cooling water is directly supplied from the water jacket 3 of the internal combustion engine to the radiator 7, and a passage from the water jacket 3 through the vaporizer 11 to the thermostat valve 15.
[0027]
In the thermostat valve 15, as shown in FIG. 8, the cooling water discharge part 150 is at the suction port of the cooling water pump 1, the first cooling water suction part 151 is at the cooling water outlet of the radiator 7, and the second cooling water. The suction part 152 is connected to the cooling water outlet of the water jacket 3 of the internal combustion engine, and the third cooling water suction part 153 is connected to the cooling water outlet of the vaporizer 11.
[0028]
The temperature of the cooling water flowing into the thermostat valve 15 is detected by a temperature sensing unit 156 that contains wax or the like. When the temperature is not more than the predetermined temperature, the first valve 154 is closed, and the cooling water discharge part 150 and the first cooling water suction part 151 are shut off. When the cooling water temperature rises above the predetermined temperature, the first valve 154 opens, the first cooling water suction part 151 communicates with the cooling water discharge part 150, and the water jacket 3 of the internal combustion engine overheats to a high temperature. The cooled water is supplied to the radiator 7 and cooled by the radiator 7.
[0029]
Further, a second valve 155 is provided in the lower part of the thermostat valve 15, the second cooling water suction part 152, and the third cooling water suction part 153. The second valve 155 is linked to the opening and closing of the first valve 154. Opening is performed at the same time. Therefore, when the cooling water temperature is equal to or lower than the predetermined temperature, the second valve 155 is opened and the cooling water discharge part 150 communicates with the second cooling water suction part 152 and the third cooling water suction part 153, and conversely the cooling water. When the temperature rises above the predetermined temperature, the second valve 155 is closed and the cooling water discharge part 150, the second cooling water suction part 152, and the third cooling water suction part 153 are shut off. Thus, when the internal combustion engine is cold started, the cooling water heated in the water jacket 3 is supplied to the jacket of the carburetor 11 to heat the vicinity of the low-speed fuel supply port in the carburetor 11 and Freezing of the fuel supply port is prevented.
[0030]
Thus, also in this embodiment, the same operational effects as those in the above embodiments can be obtained.
[Brief description of the drawings]
FIG. 1 is an overall configuration diagram showing an embodiment of the present invention.
FIG. 2 is a schematic view in which a part is similarly omitted.
FIG. 3 is a detailed longitudinal sectional side view showing a state in which the radiator side outlet of the thermostat valve in FIGS. 1 and 2 is open.
FIG. 4 is a detailed longitudinal sectional side view showing the closed state.
FIG. 5 is a detailed longitudinal side view showing a thermostat valve according to a second embodiment of the present invention.
FIG. 6 is an overall configuration diagram showing a third embodiment of the present invention.
FIG. 7 is an overall configuration diagram showing a fourth embodiment of the present invention.
8 is a detailed longitudinal side view showing the thermostat valve in FIG. 7; FIG.
FIG. 9 is a view showing a cooling water passage structure to be compared in order to explain the effect of the present invention.
FIG. 10 is an overall configuration diagram showing an example of a conventional cooling water passage structure.
FIG. 11 is a schematic diagram in which a part is also omitted.
12 is a detailed vertical side view showing the thermostat valve in FIGS. 10 and 11. FIG.
[Explanation of symbols]
01, 1 ... Cooling water pump, 02, 2 ... Passage, 03, 3 ... Water jacket, 04, 4 ... Passage, 05, 5, 15 ... Thermostat valve, 06, 6 ... Passage, 07, 7 ... Radiator, 08, 8 ... passage, 09, 9 ... bypass passage, 010, 10 ... warm water riser passage, 011, 11 ... vaporizer, 050, 50 ... cooling water suction part, 051, 51 ... first cooling water discharge part, 052, 52 ... Second cooling water discharge part, 053, 53 ... third cooling water discharge part, 53a ... through hole, 054, 54, 154 ... first valve, 055, 55, 155 ... second valve, 55a ... through hole, 056, 56, 156 ... temperature sensing part, 150 ... cooling water discharge part, 151 ... first cooling water suction part, 152 ... second cooling water suction part, 153 ... third cooling water suction part.

Claims (3)

内燃機関のウォータジャケットとラジエータとの間で冷却水を循環させる冷却水ポンプを設け、サーモスタット弁により冷却水の循環量を制御しつつ、冷間時にはバイパス通路によりラジエータを介さずに冷却水を循環させるようにした冷却水通路構造において、
上記バイパス通路と並列に形成された温水ライザー通路の一端を上記冷却水ポンプの出入口に連通させるとともに他端を上記サーモスタット弁の上記バイパス通路出入口開閉部に対して独立して連通させ、上記サーモスタット弁における上記バイパス通路出入口と上記温水ライザー通路出入口とが同一の弁体によって開閉されるようにしたことを特徴とする水冷式内燃機関の冷却水通路構造。 A cooling water pump that circulates the cooling water between the water jacket and the radiator of the internal combustion engine is provided, and the cooling water is circulated through the bypass passage without passing through the radiator when it is cold while controlling the circulation amount of the cooling water by the thermostat valve. In the cooling water passage structure that is allowed to
One end of a hot water riser passage formed in parallel with the bypass passage communicates with an inlet / outlet of the cooling water pump, and the other end communicates independently with the bypass passage inlet / outlet opening / closing portion of the thermostat valve , and the thermostat valve A cooling water passage structure for a water-cooled internal combustion engine, wherein the bypass passage inlet / outlet and the hot water riser passage inlet / outlet are opened and closed by the same valve body . 内燃機関のウォータジャケットとラジエータとの間で冷却水を循環させる冷却水ポンプを設け、サーモスタット弁により冷却水の循環量を制御しつつ、冷間時にはバイパス通路によりラジエータを介さずに冷却水を循環させるようにした冷却水通路構造において、A cooling water pump that circulates the cooling water between the water jacket and the radiator of the internal combustion engine is provided, and the cooling water is circulated through the bypass passage without passing through the radiator when it is cold while controlling the circulation amount of the cooling water by the thermostat valve. In the cooling water passage structure that is allowed to
上記バイパス通路と並列に形成されて気化器を経由する温水ライザー通路の一端を上記冷却水ポンプの出入口に連通させるとともに他端を上記サーモスタット弁の上記バイパス通路出入口開閉部に対して独立して連通させ、上記サーモスタット弁における上記バイパス通路出入口と上記温水ライザー通路出入口とが同一の弁体によって開閉されるようにしたことを特徴とする水冷式内燃機関の冷却水通路構造。One end of the hot water riser passage formed in parallel with the bypass passage and passing through the vaporizer is communicated with the inlet / outlet of the cooling water pump, and the other end communicates independently with the bypass passage inlet / outlet opening / closing portion of the thermostat valve. A cooling water passage structure for a water-cooled internal combustion engine, wherein the bypass passage inlet / outlet and the hot water riser passage inlet / outlet of the thermostat valve are opened and closed by the same valve body. 内燃機関のウォータジャケットとラジエータとの間で冷却水を循環させる冷却水ポンプを設け、サーモスタット弁により冷却水の循環量を制御しつつ、冷間時にはバイパス通路によりラジエータを介さずに冷却水を循環させるようにし、A cooling water pump that circulates the cooling water between the water jacket and the radiator of the internal combustion engine is provided, and the cooling water is circulated through the bypass passage without passing through the radiator when it is cold while controlling the circulation amount of the cooling water by the thermostat valve. And let
上記サーモスタット弁には第１、第２および第３の冷却水吐出部を設け、第１の冷却水吐出部には、ラジエータに至る通路を接続し、第２の冷却水吐出部には、上記冷却水ポンプに接続される上記バイパス通路を接続し、第３の冷却水吐出部には、上記バイパス通路と並列に形成されて気化器を経由する温水ライザ通路を接続した冷却水通路構造において、The thermostat valve is provided with first, second and third cooling water discharge portions, a passage leading to a radiator is connected to the first cooling water discharge portion, and the second cooling water discharge portion has the above-mentioned In the cooling water passage structure in which the bypass passage connected to the cooling water pump is connected, and the third cooling water discharge portion is connected in parallel with the bypass passage to the hot water riser passage that passes through the vaporizer,
上記第２の冷却水吐出部および上記第３の冷却水吐出部を同時に開閉する同一の弁体を設けたことを特徴とする水冷式内燃機関の冷却水通路構造。A cooling water passage structure for a water-cooled internal combustion engine, comprising the same valve body that opens and closes the second cooling water discharge part and the third cooling water discharge part simultaneously.
JP2000115415A 2000-04-17 2000-04-17 Cooling water passage structure for water-cooled internal combustion engine Expired - Fee Related JP4357693B2 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
JP2000115415A JP4357693B2 (en) 2000-04-17 2000-04-17 Cooling water passage structure for water-cooled internal combustion engine
CNB011220945A CN1139721C (en) 2000-04-17 2001-04-12 Cooling water channel structure of water-cooled internal combustion engine
TW090205818U TW482247U (en) 2000-04-17 2001-04-13 Cooling water passage structure for water-cooled type internal combustion engine
EP01109545A EP1148216B1 (en) 2000-04-17 2001-04-17 Cooling water passage structure for water-cooled type internal combustion engine
ES200100886A ES2190334B1 (en) 2000-04-17 2001-04-17 COOLING WATER PASS STRUCTURE FOR INTERNAL COMBUSTION ENGINE OF WATER COOLED TYPE.

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Application Number Priority Date Filing Date Title
JP2000115415A JP4357693B2 (en) 2000-04-17 2000-04-17 Cooling water passage structure for water-cooled internal combustion engine

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JP2001295646A JP2001295646A (en) 2001-10-26
JP4357693B2 true JP4357693B2 (en) 2009-11-04

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FR2832187B1 (en) * 2001-11-13 2005-08-05 Valeo Thermique Moteur Sa THERMAL ENERGY MANAGEMENT SYSTEM DEVELOPED BY A MOTOR VEHICLE THERMAL MOTOR
US20090183696A1 (en) * 2008-01-18 2009-07-23 O'flynn Kevin P Liquid cooling system for internal combustion engine

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US1550862A (en) * 1918-06-04 1925-08-25 Austin M Wolf Internal-combustion engine and method of operating the same
FR2531489B1 (en) * 1982-08-05 1987-04-03 Marchal Equip Auto COOLING DEVICE OF AN INTERNAL COMBUSTION ENGINE
US5079488A (en) * 1988-02-26 1992-01-07 General Electric Company Electronically commutated motor driven apparatus
JP3838452B2 (en) * 1996-12-17 2006-10-25 本田技研工業株式会社 Cooling water passage structure of water-cooled internal combustion engine for small vehicles such as motorcycles

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CN1321824A (en) 2001-11-14
EP1148216A3 (en) 2003-02-05
EP1148216A2 (en) 2001-10-24
JP2001295646A (en) 2001-10-26
TW482247U (en) 2002-04-01
CN1139721C (en) 2004-02-25
EP1148216B1 (en) 2006-09-06
ES2190334A1 (en) 2003-07-16
ES2190334B1 (en) 2004-08-16

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